Предмет: Химия, автор: unicorns5533

В реакцию вступило 50 г 5% раствора карбоната натрия с соляной кислотой. Какая масса и количество вещества углекислого газа получиться в результате реакции

Ответы

Автор ответа: карина866
0
Дано
mр-ра(Na2CO3)-50г
w(Na2CO3)-5%-0,05
Найти
m(CO2)
V(CO2)

Решиние
Na2CO3+2HCl=2NaCl+CO2+H2O
m(Na2CO3)=mр-ра•w=50г•0,05=2,5г
n(Na2CO3)=m/M=2,5г/106г/моль=0,02моль
n(CO2)=0,02моль
m(CO2)=n•M=0,02моль•44г/моль=0,88г
V(CO2)=n•Vm=0,02моль•22,4л/моль=0,448л
Вроде бы так ))
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Предмет: Английский язык, автор: gulaevadiana2009
The grove of the Dancing Birches
In the mountains of northern Kazakhstan, there is a lake with clean water called Burabai. Around the lake, there are beautiful pine trees and pretty groves of birch trees. But how did these trees come to be? There is a story about one of these groves.
Once upon a time, there was a lovely village by the side of Burabai. One day, its people decided to organise a special festival. There were games and competitions to test the intelligence, skill and strength of the young people, as well as songs and poetry. But the most important part of the festival was the dancing!
When the Khan heard about the festival, he decided to go and see the singing, dancing and games for himself. But he realized that if any of the other people recognized him, they would be uncomfortable and wouldn’t dance or sing freely.
So, he took off all his rich jewels and put on simple clothes to look like an ordinary person. In this way, he could go to the festival secretly!
At the festival, everyone was having a great time playing games and sports. Eventually, the music started and all the young women got up and started dancing. The Khan was so amazed by their grace. He jumped up out of his seat and started complimenting the dancers on their skill and beauty. The girls recognized the Khan. They were so terrified that they froze where they stood and turned into a grove of white birch trees!
To this day, many people from Kazakhstan and other parts of the world travel to the Grove of the Dancing Birches to admire its beauty and hear the incredible story of the Khan and the girls who became trees.



Ex 2. Прочитай текст и ответь на вопросы:
1. What surrounds Lake Burabai in Kazakhstan?
2. Why does the Khan want to go secretly to the festival?
3. What was everyone doing before the dancing started?
4. Why did the Khan jump out of his seat
5. What happened to the girls after they saw the Khan?​